Hello,                                                                                                                                                                  I need more help on understanding electronic component lingo.What does IRFP140. IR 77.407L with a 09 underneath it stand for.Thanks for all the INPUT.                                                                                                                                                                  ADV

Can anyone direct me to where I can purchase OP Amps.I tried Loud Technologies and had no sucess.Any Help Will be Appreciated. Thanks ADV

Hello , Ive recently had a noise out of this amp. Without a guitar plugged in it makes a noise. I will descibe the sound which may have  some humor.It sounds like a ticking or farting sound and then like a zooooooot sound. then it will quit and repeat the process.It does it on any channel or manual switch, pre-set,etc!!!Can anyone help a struggling muscian out on this probelm. Any help will be a great help.     Thanks adv

Hello I have a crate gfx 120 amp. Im getting no sound out of it when I plug in an guiter. I can unplug the guitar and touch the end of the cord and still I dont get any signal noise. When I plug a cord in the external speaker jack and touch the end of it, I get a low voltage shock through my fingers. Does any one know what my probelm could be? os steps on troble shooting the probelm. Thanks for the help adv

I have some questions about testing electronics. Do I test a circuit with amp pluged in or unpluged on in put stages? Can I discharge a electrolytic in the pc board itself? How do I test a IC or operational amp? On a schematic (TP) does that stand for test point? Can I use a muti tester for these procedures? Thanks ahead of time for any input and lessons!

Hello,This is first time to post!I bought a used crate 410 triode.Im having probelms with it though.The amp has a hiss in it which amplifies when I turn the volume knob up,and the hiss amplifies on every knob I turn,(The hiss sounds like a pink nose mic on which is used on a Rain E.Q.) The amp has two pre-amp tubes(ax-7 s ).I pulled the tube fatherest away from the input and the hiss became very faint,and then I pulled the tube closest to the input and the amp went dead,not even a light came on the front of the amp.I would like to repair it myself and Im a newbie in electronics.I need to know,since this is solid state with pre amp tubes,How do I dis-charge(De-Zapp) the amp? I would appreciate If an experience person could give me some pointers on repairing the amp.I would be very grateful for the input. Thanks  ADV